CN209626168U - A kind of quick disjunction mechanism based on vortex repulsion principle - Google Patents
A kind of quick disjunction mechanism based on vortex repulsion principle Download PDFInfo
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- CN209626168U CN209626168U CN201920701725.1U CN201920701725U CN209626168U CN 209626168 U CN209626168 U CN 209626168U CN 201920701725 U CN201920701725 U CN 201920701725U CN 209626168 U CN209626168 U CN 209626168U
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Abstract
The utility model proposes a kind of quick disjunction mechanisms based on vortex repulsion principle, including control unit, driving circuit and vortex repulsive force mechanism；Vortex repulsive force mechanism includes closing coil disk A, opening coil disk C, repulsion dish B, increases magnetic sheet E, link mechanism F, permanent magnet and counter-force elastic component；Repulsion dish B is located between closing coil disk A, opening coil disk C；Control unit pushes repulsion dish B through driving circuit control closing coil disk A, opening coil disk C to be vortexed repulsion；Contact mechanism of the repulsion dish B through link mechanism driving disjunction mechanism is mobile to execute separating brake operation or combined floodgate operation；Permanent magnet is divided at opening coil disk C side and link mechanism, to provide closing retention force when closing a floodgate；Counter-force elastic component is set to opening coil disk C side so that the contact mechanism after separating brake maintains separating brake；The utility model can have that structure is simple, the response time is short, quick action, is easy to the characteristics of drive control while realizing short circuit current quick disjunction.
Description
Technical field
The utility model relates to device for switching technical field, especially a kind of quick cutting machine based on vortex repulsion principle
Structure.
Background technique
Once short trouble occurs in low-voltage distribution system, short circuit current rises to tens times of running current,
Even hundreds of times, seriously threaten the safe and reliable operation of electric system.Distribution protection device directly takes on fast and reliable disjunction
The task of short circuit current, how to improve its short circuit current breaking capacity all the time is all a highly important research contents.
The structure for being vortexed repulsive force mechanism is simple, and repulsion forms the time and action response time is extremely short, and initial acceleration is big, can
Effectively realize quickly close point, can early stage short circuit current quick disjunction dynamic/static contact and formed compared with large opening, have substantially
On the basis of degree improves mechanism action speed, the feature of reducing mechanism movement dispersibility.In terms of structure of contact terminal, double break contact knot
Structure forms double breaking points arc region during disjunction short circuit current, and arc voltage greatly improved, with traditional single-break structure
Compared to superior short circuit breaking performance.The movement velocity for improving contact can reduce the dead time of electric arc, accelerate event
Hinder the speed of excision.
Domestic and foreign scholars have made intensive studies the various aspects such as the structure of contact terminal of device for switching, arc quenching system, and
The a variety of current limlitings of integrated application and arc extinguishing measure improve short circuit breaking capacity.Such as the TeSys U and west gate of Schneider Electric Corp.
KB0 the and VK60 series of products of the series of products such as the 3RA6 of subsidiary and China's independent development, although the control developed at present
It is some present in discrete component with protecting electric appliance to solve the problems, such as to a certain extent, but on the whole, existing several productions
Product are to be controlled using the rapid cut-off trip gear of breaker and the electromagnetic mechanism of contactor same set of contact system,
It is larger there are volume and be unfavorable for the exploitation of mechanism controls functional intellectualization to realize the function of distribution line control and protection
Technical bottleneck, and mainly from the mechanical structure and contact of electromagnetism and transmission system and the connecting-disconnecting function angularly of arc quenching system
Its performance is improved, in terms of the quick acting of the early detection of short circuit current and operating mechanism still needs to further increase.At present
It is badly in need of the protection electric appliance that a kind of short response time, quick action, current limiting capacity is strong, can flexibly drive, realizes that short circuit current is fast
Fast disjunction.
Summary of the invention
The utility model proposes a kind of quick disjunction mechanisms based on vortex repulsion principle, can realize that short circuit current is quick
While disjunction, have that structure is simple, the response time is short, quick action, is easy to the characteristics of drive control.
The utility model uses following technical scheme.
A kind of quick disjunction mechanism based on vortex repulsion principle, the disjunction mechanism include that control unit and control are single
Vortex repulsive force mechanism member connected driving circuit and be connected with driving circuit；The vortex repulsive force mechanism includes closing coil disk
A, opening coil disk C, repulsion dish B, increasing magnetic sheet E, link mechanism F, permanent magnet and counter-force elastic component；The repulsion dish B, which is located at, to be closed
Between lock coil panel A, opening coil disk C；Described control unit through driving circuit control closing coil disk A, opening coil disk C with
Repulsion is vortexed to push repulsion dish B；Contact mechanism of the repulsion dish B through link mechanism driving disjunction mechanism is mobile to execute point
Lock operation or combined floodgate operation；The permanent magnet is divided at opening coil disk C side and link mechanism, to mention in combined floodgate operation
For closing retention force；The counter-force elastic component is set to opening coil disk C side so that the contact mechanism after separating brake maintains separating brake shape
State.
The contact mechanism is double-fracture structure of contact terminal, and the double-fracture structure of contact terminal is that can form two in short trouble
The fault electric arc of times traditional single-break circuit breaker is to inhibit the structure of contact terminal of the development of short circuit current.
The counter-force elastic component is set to the base position of disjunction mechanism；The opening coil disk C is set to the pedestal of disjunction mechanism
Place；The permanent magnet includes the top permanent magnet at link mechanism and the bottom permanent magnet set on base position；The top
Permanent magnet is attracted with bottom permanent magnet face and in combined floodgate operation；The driving circuit includes IGBT.
The repulsion dish B is connected with the driving end of link mechanism；Buffer unit G is equipped at the driving end of link mechanism；When
When executing the contact of separating brake operation and contact mechanism close to maximum travel position, the buffer unit G linkage drives end
It is buffered to absorb the remaining momentum of repulsion dish at this time.
The driving circuit is with thyristor controlled driving circuit, and driving circuit includes that capacitor charging circuit, capacitor are put
Electrical circuit；The capacitor discharge loop can be to the coil discharge of disjunction mechanism；The coil includes closing coil disk A, separating brake line
Enclose disk C；
In the capacitor charging circuit, the lesser DC voltage of ripple is obtained through over commutation and filtering with single-phase alternating current
Source, the DC voltage source can charge after switch S closure to storage capacitor, and open after capacitance voltage reaches preset value
Close S.
IGBT is set in the capacitor discharge loop to control discharge time of the storage capacitor to coil；The IGBT can make to store up
Energy capacitor is in each combined floodgate operation or each separating brake operation only to releasing winding part electric energy；The coil both ends, which are parallel with, lets out
It puts back to road and IGBT is damaged with the overvoltage for preventing coil inductance from generating.
The disjunction mechanism includes the following steps when executing separating brake operation；
When A1, control unit receive separating brake order, control unit sends separating brake trigger signal to driving circuit；
The energy in storage capacitor is had previously been stored in A2, capacitor discharge loop in the extremely short time to opening coil disk
Electric discharge, make opening coil disk be vortexed repulsion driving repulsion dish, repulsion dish quickly to far from opening coil disk direction move with
Drive link mechanism；
A3, top permanent magnet and bottom permanent magnet separate, and contact mechanism acts under the driving of link mechanism, when contact machine
When structure contact is close to maximum travel position, it is mounted on the buffer unit at the top of link mechanism and absorbs the remaining energy of repulsion dish at this time
Amount.
The counter-force elastic component is reaction spring；Contact secondary spring is equipped at the contact mechanism；The disjunction mechanism
Include the following steps when executing combined floodgate operation；
When B1, control unit receive combined floodgate order, control unit sends combined floodgate trigger signal to driving circuit；
The energy in storage capacitor is had previously been stored in B2, capacitor discharge loop in the extremely short time to closing coil disk
Electric discharge, make closing coil disk be vortexed repulsion driving repulsion dish, repulsion dish quickly to far from closing coil disk direction move with
Drive link mechanism closes a floodgate；
B3, in making process, reaction spring is compressed, and after the dynamic and static contact closure of contact mechanism, repulsion dish band
Dynamic link mechanism continues to move, and compression contacts secondary spring guarantees certain excess of stroke；
B4, at the end of combined floodgate operation, contact is in closing position, and reaction spring is compressed, be fixed on link mechanism and
Permanent magnet on pedestal is attracted and overcomes reaction spring and contact secondary spring active force, provides contact end pressure, contact is allowed to protect
It holds in "on" position, the repulsion dish are in one side close to opening coil disk and there are initial air gaps；
B5, control unit output relay trigger signal are connected relay with closure switch S, and capacitor charging circuit is again
It charges to storage capacitor.
The driving circuit is the driving circuit that the forceful electric power of discharge loop can be isolated；The driving circuit uses MOC3052
Optocoupler triggers controllable silicon SCR conducting；The controller of described control unit includes the DSP of TMS320F2812 model；The DSP draws
It connects after foot is connected to amplify output electric current with C9016 triode, then after pulling up+5V power supply with optocoupler input；If DSP pin
High level then triode and optocoupler conducting are exported, and then drives the controlled silicon conducting of discharge loop, otherwise triode ends, optocoupler
It is also switched off, it is silicon-controlled to be not turned on.
During the utility model feed motion, IGBT controls coil panel electric current by the discharge time of optimization, by
In vortex repulsion action time it is very short, therefore repulsion dish can under the action of reaction spring with smaller end speed close to separating brake
Coil panel, while so that mechanism is finally stably held in "on" position by the suction of permanent magnet, and do not generate spring.
In the utility model separating brake action process, the discharge current of storage capacitor just arrives reach to peak value in 130us or so
The average rate of climb of 4.56kA, electric current are about 35A/us, and so big current-rising-rate is beneficial to vortex repulsive force mechanism
Quick response greatly shortens the quick break of model machine dynamic/static contact.In the utility model, repulsion is vortexed about in 110us
Reach to peak value 8140N is arrived in left and right, when short trouble occurs, repulsion dish in a very short period of time by so big vortex repulsion, and
By link mechanism band movable contact system with biggish initial acceleration quick acting, in " rudiment " the period just shape of short circuit current
At the ability to bear of overvoltage when low voltage control protection electric appliance cut-offs short circuit current compared with large opening, can be effectively improved and finally may be used
By blow-out.
The utility model can quickly and reliably drive controlled silicon conducting, improve the response speed of mechanism；Meanwhile it being based on
Be vortexed repulsion principle quick disjunction mechanism can capacitor start electric discharge after quick acting, improve the just-off speed of contact, have
Inhibit and quick disjunction conducive to the early stage of short-circuit current.Improve the reliability of system safety operation, support personnel, equipment
Safety.
Electric appliance is protected using the low voltage control of vortex repulsive force mechanism in the utility model, short trouble is greatly shortened
The time that contact is opened afterwards, and clearance between open contacts can be increased with the movement velocity being exceedingly fast, the utility model cooperates short trouble early
Phase detection, can generate immediately electric arc when short trouble occurs, and play current limliting inhibiting effect to short circuit current.
Detailed description of the invention
With reference to the accompanying drawings and detailed description to the further details of explanation of the utility model:
Attached drawing 1 is the system structure diagram of the utility model；
Attached drawing 2 is the schematic diagram of internal structure of the utility model；
Attached drawing 3 is the control unit of the utility model and the schematic illustration of driving circuit；
Attached drawing 4 is the schematic illustration of driving circuit；
Attached drawing 5 is the drive characteristic schematic diagram of the utility model；
Attached drawing 6 is the wiring schematic diagram that the utility model is used for failure disjunction experiment；
Attached drawing 7 is the dynamic characteristic schematic diagram of the separating brake of the utility model, combined floodgate；
Attached drawing 8 is under different faults voltage initial angle, and the utility model shows in the short circuit current disjunction result of fault point
It is intended to；
In figure: 1- closing coil disk A；2- repulsion dish B；3- opening coil disk C；4- increases magnetic sheet E；5- link mechanism F；6- is forever
Magnet；7- counter-force elastic component；8- control unit；9- contact mechanism；10- top permanent magnet；11- bottom permanent magnet；12- pedestal.
Specific embodiment
As shown in figures 1-8, a kind of quick disjunction mechanism based on vortex repulsion principle, the disjunction mechanism include 8 controls
Unit, the driving circuit being connected with control unit and the vortex repulsive force mechanism being connected with driving circuit；The vortex repulsive force mechanism
Increase magnetic sheet E, 5 link mechanism F, 6 permanent magnets and 7 counter-forces elasticity including 1 closing coil disk A, 3 opening coil disk C, 2 repulsion dish B, 4
Part；The repulsion dish B is located between closing coil disk A, opening coil disk C；Described control unit is controlled through driving circuit and is closed a floodgate
Coil panel A, opening coil disk C push repulsion dish B to be vortexed repulsion；The repulsion dish B drives disjunction mechanism through link mechanism
9 contact mechanisms it is mobile to execute separating brake operation or combined floodgate operation；The permanent magnet is divided into opening coil disk C side and connecting rod
At mechanism, to provide closing retention force in combined floodgate operation；The counter-force elastic component is set to opening coil disk C side so that separating brake
Contact mechanism afterwards maintains gate-dividing state.
The contact mechanism is double-fracture structure of contact terminal, and the double-fracture structure of contact terminal is that can form two in short trouble
The fault electric arc of times traditional single-break circuit breaker is to inhibit the structure of contact terminal of the development of short circuit current.
The counter-force elastic component is set to 12 base positions of disjunction mechanism；The opening coil disk C is set to the bottom of disjunction mechanism
At seat；The permanent magnet includes the top permanent magnet at link mechanism and the bottom permanent magnet set on base position；Described 10
Top permanent magnet is attracted with 11 bottom permanent magnet faces and in combined floodgate operation；The driving circuit includes IGBT.
The repulsion dish B is connected with the driving end of link mechanism；Buffer unit G is equipped at the driving end of link mechanism；When
When executing the contact of separating brake operation and contact mechanism close to maximum travel position, the buffer unit G linkage drives end
It is buffered to absorb the remaining momentum of repulsion dish at this time.
The driving circuit is with thyristor controlled driving circuit, and driving circuit includes that capacitor charging circuit, capacitor are put
Electrical circuit；The capacitor discharge loop can be to the coil discharge of disjunction mechanism；The coil includes closing coil disk A, separating brake line
Enclose disk C；
In the capacitor charging circuit, the lesser DC voltage of ripple is obtained through over commutation and filtering with single-phase alternating current
Source, the DC voltage source can charge after switch S closure to storage capacitor, and open after capacitance voltage reaches preset value
Close S.
IGBT is set in the capacitor discharge loop to control discharge time of the storage capacitor to coil；The IGBT can make to store up
Energy capacitor is in each combined floodgate operation or each separating brake operation only to releasing winding part electric energy；The coil both ends, which are parallel with, lets out
It puts back to road and IGBT is damaged with the overvoltage for preventing coil inductance from generating.
The disjunction mechanism includes the following steps when executing separating brake operation；
When A1, control unit receive separating brake order, control unit sends separating brake trigger signal to driving circuit；
The energy in storage capacitor is had previously been stored in A2, capacitor discharge loop in the extremely short time to opening coil disk
Electric discharge, make opening coil disk be vortexed repulsion driving repulsion dish, repulsion dish quickly to far from opening coil disk direction move with
Drive link mechanism；
A3, top permanent magnet and bottom permanent magnet separate, and contact mechanism acts under the driving of link mechanism, when contact machine
When structure contact is close to maximum travel position, it is mounted on the buffer unit at the top of link mechanism and absorbs the remaining energy of repulsion dish at this time
Amount.
The counter-force elastic component is reaction spring；Contact secondary spring is equipped at the contact mechanism；The disjunction mechanism
Include the following steps when executing combined floodgate operation；
When B1, control unit receive combined floodgate order, control unit sends combined floodgate trigger signal to driving circuit；
The energy in storage capacitor is had previously been stored in B2, capacitor discharge loop in the extremely short time to closing coil disk
Electric discharge, make closing coil disk be vortexed repulsion driving repulsion dish, repulsion dish quickly to far from closing coil disk direction move with
Drive link mechanism closes a floodgate；
B3, in making process, reaction spring is compressed, and after the dynamic and static contact closure of contact mechanism, repulsion dish band
Dynamic link mechanism continues to move, and compression contacts secondary spring guarantees certain excess of stroke；
B4, at the end of combined floodgate operation, contact is in closing position, and reaction spring is compressed, be fixed on link mechanism and
Permanent magnet on pedestal is attracted and overcomes reaction spring and contact secondary spring active force, provides contact end pressure, contact is allowed to protect
It holds in "on" position, the repulsion dish are in one side close to opening coil disk and there are initial air gaps；
B5, control unit output relay trigger signal are connected relay with closure switch S, and capacitor charging circuit is again
It charges to storage capacitor.
The driving circuit is the driving circuit that the forceful electric power of discharge loop can be isolated；The driving circuit uses MOC3052
Optocoupler triggers controllable silicon SCR conducting；The controller of described control unit includes the DSP of TMS320F2812 model；The DSP draws
It connects after foot is connected to amplify output electric current with C9016 triode, then after pulling up+5V power supply with optocoupler input；If DSP pin
High level then triode and optocoupler conducting are exported, and then drives the controlled silicon conducting of discharge loop, otherwise triode ends, optocoupler
It is also switched off, it is silicon-controlled to be not turned on.
Embodiment:
In order to which the purpose of this utility model, technical solution and advantage is more clearly understood, below in conjunction with Figure of description
With concrete practice mode, the utility model is described in further detail.
The first step, the quick disjunction mechanism model of design such as Fig. 2, by designing optimized parameter, vortex repulsive force mechanism is completed
It is 5.39ms that the time of stroke is most short, and its velocity peak values reaches 3.39m/s, average speed 2.99m/s.
Second step builds the quick disjunction mechanism system such as Fig. 6, forms low-voltage alternating-current control protection electric appliance model machine.
Third step builds the control wiring such as Fig. 6, and all short circuit trouble points in experimental system are all led in operation cabinet,
It can control the generation and excision of short trouble.Fault type control cabinet is for selecting single-phase short circuit, two-phase phase fault, three-phase
The various faults type such as phase fault.
Quick disjunction mechanism based on vortex repulsion principle is accessed the short trouble control loop of Fig. 3, driving by the 4th step
It is acted.Quick disjunction mechanism divide-shut brake dynamic characteristic test is carried out, realizes that storage capacitor puts coil panel by control IGBT
The control of electric time, while accelerating capacitor charging rate again can also reducing mechanism divide-shut brake spring, improve the machine of model machine
Tool service life and electrical endurance, Fig. 5 are the combined floodgate dynamic characteristic under model machine IGBT control.
5th step carries out short trouble experiment, after short trouble generation, reliable false trigger signals is issued, short
When road electric current not yet rises to peak value, triggering low voltage control protects the quick acting of electric appliance model machine, utilizes the quick of the model machine
Breaking characteristics, it can be achieved that low-voltage distribution short trouble quick excision.Fig. 8 is fault point in different faults voltage initial angle
Short circuit current disjunction waveform.From Fig. 8 (a) it is found that when false voltage initial phase angle is 36 °, after 0.30ms occurs for failure, driving is quick
Disjunction mechanism movement, entire communication process have only spent 0.14ms.Peak value of short is suppressed in 628.46A, occurs from failure
It is only 5.72ms to the failure complete resection of time (break).When false voltage initial phase angle is 92 °, 130 ° and 215 °, in advance
Phase peak value is that the peak value of short of 1900A or so is suppressed in 844.40A, 510.05A and -695.67A, break respectively
Respectively 3.79ms, 2.24ms and 5.20ms.
From the foregoing, the utility model has the beneficial effects that: this patent is studied using quick breaking technology, design
Driving circuit can drive controlled silicon conducting fast and reliablely, improve the response speed of mechanism；Meanwhile it is former based on vortex repulsion
The quick disjunction mechanism quick action of reason, can quickly open contact, be conducive to short-circuit current early stage inhibit with it is fast
Fast disjunction.Meanwhile the protection system of design can be obtained quickly and accurately as a result, cooperating the quick reliable disjunction of disjunction mechanism energy short
Road fault current realizes the quick breaking technology of short circuit current.
Claims (7)
1. it is a kind of based on vortex repulsion principle quick disjunction mechanism, it is characterised in that: the disjunction mechanism include control unit,
The driving circuit being connected with control unit and the vortex repulsive force mechanism being connected with driving circuit；The vortex repulsive force mechanism includes closing
Lock coil panel A, opening coil disk C, repulsion dish B, increase magnetic sheet E, link mechanism F, permanent magnet and counter-force elastic component；The repulsion dish
B is located between closing coil disk A, opening coil disk C；Described control unit controls closing coil disk A, separating brake line through driving circuit
It encloses disk C and pushes repulsion dish B to be vortexed repulsion；Contact mechanism of the repulsion dish B through link mechanism driving disjunction mechanism is mobile
To execute separating brake operation or combined floodgate operation；The permanent magnet is divided at opening coil disk C side and link mechanism, to close a floodgate
Closing retention force is provided in operation；The counter-force elastic component is set to opening coil disk C side so that the contact mechanism after separating brake is tieed up
Hold gate-dividing state.
2. a kind of quick disjunction mechanism based on vortex repulsion principle according to claim 1, it is characterised in that: the touching
Head mechanism is double-fracture structure of contact terminal, and the double-fracture structure of contact terminal is that twice traditional single break can be formed in short trouble
The fault electric arc of breaker is to inhibit the structure of contact terminal of the development of short circuit current.
3. a kind of quick disjunction mechanism based on vortex repulsion principle according to claim 1, it is characterised in that: described anti-
Power elastic component is set to the base position of disjunction mechanism；The opening coil disk C is set to the base position of disjunction mechanism；The permanent magnet packet
Include the top permanent magnet being set at link mechanism and the bottom permanent magnet set on base position；The top permanent magnet and bottom permanent magnetism
It body face and is attracted in combined floodgate operation；The driving circuit includes IGBT.
4. a kind of quick disjunction mechanism based on vortex repulsion principle according to claim 3, it is characterised in that: the reprimand
Power disk B is connected with the driving end of link mechanism；Buffer unit G is equipped at the driving end of link mechanism；When execute separating brake operation and
When the contact of contact mechanism is close to maximum travel position, buffer unit G linkage driving end is buffered to absorb
The remaining momentum of repulsion dish at this time.
5. a kind of quick disjunction mechanism based on vortex repulsion principle according to claim 3, it is characterised in that: the drive
Dynamic circuit is with thyristor controlled driving circuit, and driving circuit includes capacitor charging circuit, capacitor discharge loop；The capacitor
Discharge loop can be to the coil discharge of disjunction mechanism；The coil includes closing coil disk A, opening coil disk C；
In the capacitor charging circuit, the small DC voltage source of ripple is obtained through over commutation and filtering with single-phase alternating current, it is described
DC voltage source can charge after switch S closure to storage capacitor, and switch S is disconnected after capacitance voltage reaches preset value.
6. a kind of quick disjunction mechanism based on vortex repulsion principle according to claim 5, it is characterised in that: the electricity
IGBT is set in receiving electrical circuit to control discharge time of the storage capacitor to coil；The IGBT can be such that storage capacitor is closing every time
Only to releasing winding part electric energy when lock operation or each separating brake operation；The coil both ends are parallel with bleed-off circuit to prevent line
It encloses the overvoltage that inductance generates and damages IGBT.
7. a kind of quick disjunction mechanism based on vortex repulsion principle according to claim 6, it is characterised in that: the drive
Dynamic circuit is the driving circuit that the forceful electric power of discharge loop can be isolated；The driving circuit is triggered silicon-controlled using MOC3052 optocoupler
SCR conducting；The controller of described control unit includes the DSP of TMS320F2812 model；The DSP pin and C9016 triode
It is connected after exporting electric current with amplification, then connect after pulling up+5V power supply with optocoupler input；Three if DSP pin exports high level
Pole pipe and optocoupler conducting, and then the controlled silicon conducting of discharge loop is driven, otherwise triode ends, and optocoupler is also switched off, silicon-controlled
It is not turned on.
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| CN201920701725.1U CN209626168U (en) | 2019-05-16 | 2019-05-16 | A kind of quick disjunction mechanism based on vortex repulsion principle |
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| CN201920701725.1U CN209626168U (en) | 2019-05-16 | 2019-05-16 | A kind of quick disjunction mechanism based on vortex repulsion principle |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110010424A (en) * | 2019-05-16 | 2019-07-12 | 福州大学 | A kind of quick disjunction mechanism based on vortex repulsion principle |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110010424A (en) * | 2019-05-16 | 2019-07-12 | 福州大学 | A kind of quick disjunction mechanism based on vortex repulsion principle |
| CN110010424B (en) * | 2019-05-16 | 2024-02-06 | 福州大学 | Quick breaking mechanism based on vortex repulsion principle |
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